Cryptic phosphoribosylase activity of NAMPT restricts the virion incorporation of viral proteins
Abstract
As obligate intracellular pathogens, viruses activate host metabolic enzymes to supply intermediates that support progeny production. Nicotinamide phosphoribosyltransferase (NAMPT), the rate-limiting enzyme of salvage nicotinamide adenine dinucleotide (NAD+) synthesis, is an interferon-inducible protein that inhibits the replication of several RNA and DNA viruses through unknown mechanisms. Here, we show that NAMPT restricts herpes simplex virus type 1 (HSV-1) replication by impeding the virion incorporation of viral proteins owing to its phosphoribosyl-hydrolase (phosphoribosylase) activity, which is independent of the role of NAMPT in NAD+ synthesis. Proteomics analysis of HSV-1-infected cells identifies phosphoribosylated viral structural proteins, particularly glycoproteins and tegument proteins, which are de-phosphoribosylated by NAMPT in vitro and in cells. Chimeric and recombinant HSV-1 carrying phosphoribosylation-resistant mutations show that phosphoribosylation promotes the incorporation of structural proteins into HSV-1 virions and subsequent virus entry. Loss of NAMPT renders mice highly susceptible to HSV-1 infection. Our work describes an additional enzymatic activity of a metabolic enzyme in viral infection and host defence, offering a system to interrogate the roles of protein phosphoribosylation in metazoans.
Copyright and License
© 2024, The Author(s), under exclusive licence to Springer Nature Limited
Acknowledgement
We thank S.-I. Imai (Washington University) for providing the Namptfl/fl mice, S. Petteri (Stanford University) and N. Graham (University of Southern California) for LC–MS techniques, J. Hao (Poochon Scientific) for APEX-related protein identification, W. Beatty (Washington University) for electron microscopy analysis, W. Yuan (University of Southern California), D. Knipe (Harvard Medical School) and R. Longnecker (Northwestern University) for providing HSV-1 plasmids, J. Zhao (Cleveland Clinic Foundation) for guidance on generating HSV-1 mutant viruses, G. Cohen (University of Pennsylvania) for anti-gH antibody, C. Zhen (University of Calgary) for anti-VP22 antibody, B. Lomenick (CalTech) for processing MS samples, and N. Graham (University of Southern California) and S. Pitteri (Stanford University) for assistance on mass spectrometry analysis. We are grateful to Y. Zhou, S. Rice, J. Carriere and J. Xiao for their assistance. This work was partly supported by a startup fund from the Herman Ostrow School of Dentistry of the University of Southern California and grants from the National Institutes of Health (AG070904, CA285192 and AI180537) and Infectious Disease Society of America Foundation (Microbial Pathogenesis in AD) (P.F.) and National Natural Science Foundation of China (81821002) (C.H.).
Data Availability
All raw datasets used for phosphoribosylated peptide analysis can be found in the PRIDE public repository under project accession number PXD050684. All source data supporting the main figures and extended data figures are published within the paper. Source data are provided with this paper.
Supplemental Material
Supplementary Information
Supplementary Figures
Supplementary Table 1
Supplementary Table 1. An Excel file summarizing NAMPT-binding proteins identified by APEX2-mediated biotinylation and mass spectrometry, related to Fig. 3g (source file). Supplementary Table 2. An Excel file summarizing the NAMPT-binding HSV-1 proteins identified by APEX2-mediated biotinylation and mass spectrometry, related to Fig. 3g. Supplementary Table 3. An Excel file summarizing the phosphoribosylated peptides identified from a regular (2 h) run of HSV-1-infected cell lysates of HeLa expressing wildtype NAMPT or NAMPT-H247E mutant, related to Extended Data Fig. 6c and 6d. Supplementary Table 4. An Excel file showing the percentage of phosphoribosylated peptides normalized to the total peptides analyzed in Supplementary Table 3, related to Extended Data Fig. 6c and 6d. Supplementary Table 5. An Excel file providing the raw data for total peptides and proteins identified from an extended (4 h) run of HSV-1-infected cell lysates of HeLa expressing wildtype NAMPT or NAMPT-H247E mutant, related to Extended Data Fig. 6c and 6d. Supplementary Table 6. An Excel file providing the raw data for viral peptides and proteins identified from an extended (4 h) run of HSV-1-infected cell lysates of HeLa expressing wildtype NAMPT or NAMPT-H247E mutant, related to Extended Data Fig. 6c and 6d. Supplementary Table 7. An Excel file showing the percentage of phosphoribosylated viral peptides summarized in Supplementary Tables 5 and 6, related to Extended Data Fig. 6c and 6d. Supplementary Table 8. An Excel file summarizing the quantification of viral and cellular phosphoribosylated peptides summarized in Supplementary Tables 5 and 6, related to Extended Data Fig. 6c and 6d. Supplementary Table 9. An Excel file showing the percentage of phosphoribosylated total (viral and cellular) peptides summarized in Supplementary Tables 5 and 6, related to Extended Data Fig. 6c and 6d. Supplementary Table 10. A list of primers used in this study.
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Additional details
- National Institute on Aging
- AG070904
- National Cancer Institute
- CA285192
- National Institute of Allergy and Infectious Diseases
- AI180537
- National Natural Science Foundation of China
- 81821002
- Accepted
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2024-10-04Accepted
- Available
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2024-11-24Published online
- Caltech groups
- Division of Biology and Biological Engineering
- Publication Status
- Published